Being logged out after clicking the button 'proceed to checkout' over four times in Magento 2.06

[johanhur]

When a customer click the button 'proceed to checkout' over four times, it got logged out. 

I asked this symptom to the Enterprise Support team but no reply has been received

 So our developer edited data like below and this symptom doesn't occur again. However,  I am a bit worried about some side effects by applying this.

The edited data is below

public function save(OrderItemInterface $entity){ if ($entity->getProductOption()) { $request = $this->getBuyRequest($entity); $entity->setProductOptions(['info_buyRequest' => $request->toArray()]); }else{ $optionData = $entity->getData('product_options'); $optionData = is_string($optionData) ? unserialize(stripslashes($optionData)) : $optionData; $entity->setProductOptions($optionData); } $this->metadata->getMapper()->save($entity); $this->registry[$entity->getEntityId()] = $entity; return $this->registry[$entity->getEntityId()];}

I would like to share and hear opinions. Thank you! 

[OST Agency]

I have the same problem.

The best way to simulate the problem:

change the config -> Settings / Sales / Checkout / After Adding a Product Redirect to Shopping Cart = yes

delete the browser cache

add item to my cart

click proceed to checkout

The problem occurs only once , that is, on the first visit . Then it works normally.